LM3478MMX/NOPB – TEXAS INSTRUMENTS

The LM3478MMX/NOPB is a monolithic, synchronous step-down converter from Texas Instruments, optimized for high-efficiency, low-noise operation in applications requiring precise voltage regulation. This specific part number denotes a device packaged in a 16-pin, 4mm x 4mm QFN (quad flat no-lead) package, with a lead-free (NOPB) finish. It operates from an input voltage range of 4.5V to 28V, allowing for flexibility in various power supply designs. The LM3478MMX/NOPB features an adjustable output voltage, typically ranging from 0.8V to V_IN – 1V, achievable through external resistor divider configuration. Its switching frequency is internally fixed at approximately 1.5MHz, minimizing external component size._x000D_
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Key features include an integrated 1.5A switch, enabling relatively high current output capabilities, and a low quiescent current of approximately 30µA, contributing to excellent efficiency even under light loads. Its internal soft-start function minimizes inrush current, protecting the supply and downstream components. The device’s inherent low-noise performance makes it suitable for sensitive applications where ripple rejection is critical, such as audio equipment or instrumentation. The combination of high efficiency, compact size, and precise regulation makes the LM3478MMX/NOPB a strong candidate for portable devices, industrial controls, and other space-constrained applications demanding reliable power conversion.